Today, one more time on my Macbook pro, I can not connect to a WiFi network even the right password has not been changed since I previously connected successfully. What to do and how to fix such this Wifi problem on your Mac computer?
New update: we had just published a better solutions that work on too many users to fix al most all Wifi problems, look at: Fix Wi-Fi connection problem in OS X El Capitan, Yosemite on MacBooks.
If you can not access to your WiFi network using right password on your Macbook Pro, Macbook Air or even iMac, just simply temporarily delete the affected WiFi Network Name from the list recorded in OS X then re-connect again.
1. Go to System Preferences > NetWork > Click on “Advanced…” button > Select the WiFi network in trouble > Click on (-) button to remove it from the Wifi list recorded
Otherwise, you an attempt to fix the trouble by using the following command in Terminal: sudo ifconfig awdl0 down, read more…
In the new MacOS Sierra, you may find the same solution as this article.